CN101018056A - Rb atom frequency standard digital servo device - Google Patents
Rb atom frequency standard digital servo device Download PDFInfo
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Abstract
The disclosed Rb-atom frequency scale digital servo comprises: a filter amplification circuit with input end connected with light-detection signal output end of the frequency scale system and output end connected with input end of a SCM, the SCM with output end for lock indication and SP10 port isolated by a optical-coupling circuit and connected to spi port of a 20-bit ADC, a voltage reference circuit with output connected ADC voltage reference input, and the output of ADC connected with the input of an isolation amplification circuit. This invention overcomes defects in prior art, and fit to precise control and fast lock.
Description
Technical field
The present invention relates to Rb atom frequency marking, specifically the electronic system of Rb atom frequency marking more specifically relates to a kind of Rb atom frequency standard digital servo device, and this device can be used for making small Rb atom frequency marking.
Background technology
Rb atom frequency marking provides the equipment of high steady frequency time signal, and it has little, the lightweight characteristics of volume, is present most widely used atomic frequency standard.Its principle is to utilize rubidium atomic transition spectral line to remove to lock VCXO, and promptly the physical system of Rb atom frequency marking has the light inspection signal of kam-frequency characteristic and obtain dc error signal behind synchronous phase demodulation by output and removes servo VCXO.Therefore according to the function difference, Rb atom frequency marking can briefly be divided into physical system and electronic system, and electronic system can be divided into radio frequency frequency multiplier chain and synchronous servo device.The effect of physical system is an output light inspection signal, the degree of this signal reflection VCXO signal relative depature atomic spectral line frequency; The radio frequency frequency multiplier chain of electronic system then VCXO output frequency frequency multiplication near rubidium atomic transition frequency and carry out a little frequency modulation and go to inquire after the rubidium atomic transition, when the microwave signal of input equates with rubidium atomic transition spectral line frequency, the frequency discrimination signal of light inspection output is the second harmonic signal of modulation signal, unequal and in the absworption peak both sides of atomic transition spectral line when (left side or right), the frequency discrimination signal of light inspection output is the opposite fundamental signal of phase place; The synchronous servo device of electronic system is examined the error signal that synchronous phase demodulation that signal carries out first-harmonic obtains servo VCXO with light.With regard to the realization of Rb atom frequency marking loop control, the synchronous servo device of electronic system is the core of whole frequency marking system, the relevant parameter that normally changes this part when frequency marking is carried out parameter optimization goes adjustment loop time and gain, to obtain the stability index of Rb atom frequency marking optimum.Therefore, synchronous servo device is one of emphasis of Rb atom frequency marking research.
The traditional servomechanism installation of Rb atom frequency marking extensively adopts the synchronous phase discriminator based on analog multiplier, its technological means be with light examine in the signal first-harmonic by filter take out with modulation signal homology and phase shift reference signal multiply each other, again low pass filter is passed through in the output of multiplier, be the direct current dc error signal of servo VCXO after high-frequency signal is filtered; The phase discriminator that mainly contains crystal diode and transformer composition of servomechanism installation, and the switching regulator phase discriminator that adopts field effect transistor to form.For the former, owing to need transformer, general being difficult to made the fine transformer of symmetry, and diode exists non-linear and saturation voltage drop and the big deficiency of reverse leakage current, and it is less that this method is used in atomic frequency standard; For the latter, owing to used active field effect transistor device, its parameter to be subject to environment (as temperature) influence, can be brought additional error, circuit structure is more complicated also.In addition, because the signal of low pass part is near direct current, its time constant is very big, so it is also just very big to constitute the capacitance of this servomechanism installation, will adopts the relatively poor relatively electrochemical capacitor of performance and may cause the long-time stability and the reliability reduction of circuit.The Rb atom frequency marking that adopts the analog-servo mechanism making needs to regulate the servomechanism installation hardware parameter when parameters optimization, and it is numerous and diverse to work.
Summary of the invention
The object of the present invention is to provide a kind of Rb atom frequency standard digital servo device, have the hardware total digitalization, simple in structure, time constant filter can be provided with arbitrarily, debug characteristics such as simple, can be applicable to small Rb atom frequency marking.
To achieve these goals, the technical measures that the present invention adopts are: the input of filter amplification circuit connects Rb atom frequency marking physical system light inspection signal output part, the output of filter amplification circuit connects the integrated ADC input of single-chip microcomputer, 12 integrated DAC outputs of single-chip microcomputer are the output of locking indication end, the SPI0 mouth of single-chip microcomputer is isolated the SPI mouth that the back connects 20 figure place weighted-voltage D/A converters by photoelectric coupled circuit, the output of voltage reference circuit connects the Voltage Reference input of 20 figure place weighted-voltage D/A converters, the output of 20 figure place weighted-voltage D/A converters connects the input of isolating amplifier circuit, and the output of isolating amplifier circuit connects the voltage tuning end of VCXO in the Rb atom frequency marking.
The physical system of Rb atom frequency marking comprises rubidium spectral lamp and cavity bubble system, both directly connect, the photocell that is positioned at cavity bubble system carries out the light inspection signal that light detects and exports to the atomic transition of physical system inside generation, light inspection signal through filter amplification circuit amplify with low-pass filtering after make signal amplitude reach the 0-2.5V scope, satisfy the requirement of single-chip microcomputer input range; The single-chip microcomputer that adopts is 16 single-chip microcomputer MSP430F169 of super low-power consumption of TI company, its inner integrated 12 adc circuit and 12 s' DAC circuit, the ADC of single-chip microcomputer adopts continuous timer interrupt mode that the light inspection signal that has amplified is gathered and changed, and in the ADC interrupt service routine to the first-harmonic synchronizing software phase demodulation of gather obtain first-harmonic in the light inspection signal amplitude and, this amplitude and add a positive initial value after 20 figure place weighted-voltage D/A converters (DAC1220) are converted to analog voltage signal, this voltage signal is the dc error signal of servo VCXO after the amplification that isolating amplifier circuit necessarily gains.Adopt the SPI communication between single-chip microcomputer MSP430F169 and the 20 figure place weighted-voltage D/A converters (DAC1220), the digital signal to be converted that single-chip microcomputer carries out obtaining behind the synchronizing software phase demodulation promptly sends to 20 figure place weighted-voltage D/A converters (DAC1220) by the SPI data and carries out digital-to-analogue conversion.For guaranteeing the high accuracy of digital-to-analogue conversion, SPI communication data line between 20 figure place weighted-voltage D/A converters (DAC1220) and the single-chip microcomputer adopts photoelectric coupled circuit to carry out the photoelectricity isolation, changing required voltage reference provides for REF43 voltage reference chip, the output analog signal adopts isolating amplifier circuit to isolate, and disturbs to eliminate inter-stage.
The synchronizing software phase demodulation that carries out in the single-chip microcomputer is the core of this digital servomechanism installation.Because the light inspection signal of Rb atom frequency marking output mainly is first-harmonic and two kinds of compositions of second harmonic of microwave modulation signal.If the fundamental signal cycle of light inspection signal is T, number of times to this signal one-period sampling is n, the setting that ADC interrupts setting apparatus then is T/n at interval, utilize interrupt service routine with light examine in the signal before the fundamental signal half period data and that deduct later half cycle data and, the difference that obtains be light inspection signal first-harmonic in the one-period the interchange amplitude and.Since the fundamental signal phase place of light inspection signal may with reference signal homophase or anti-phase, so this interchange amplitude and can just can bearing, and the digital value that digital to analog converter receives require on the occasion of, so need the interchange amplitude and on add one on the occasion of F0, the signal value of guaranteeing to send to 20 figure place weighted-voltage D/A converters (DAC1220) be on the occasion of.Send to 20 figure place weighted-voltage D/A converters (DAC1220) after can and asking on average the interchange amplitude in a plurality of cycles and change, to eliminate the influence of periodic interference (as the 50Hz AC signal of power supply).Also can change the time constant of servo loop by artificial setting 20 figure place weighted-voltage D/A converters (DAC1220) for twice change-over time at interval.The digital signal of gathering is converted to the index signal of analog signal output as the Rb atom frequency standard locking state with the integrated 12DAC of single-chip microcomputer, and promptly rubidium frequency standard enters lock-out state when second harmonic appears in this output signal.The present invention has following characteristics than prior art:
1, circuit structure is simple, integrated level height, good reliability.Native system almost all is made up of integrated paster packaged chip, and the phase discrimination processing process is finished in single-chip microcomputer, and the what is called " pseudo error signal " that the reference signal amplitude shakiness of nothing simulation phase discriminator causes is disturbed, and the anti-environmental interference ability of digital device obviously strengthens.
2, parameter control accurately.The phase demodulation system is digital device substantially, and the loop transfer model can accurately obtain, and the software processes process more can be carried out accurate quantified controlling, can introduce advanced person's cybernetics and raising Rb atom frequency marking performance index.
3, parameter optimization is simple, only needs the update routine parameter to get final product.After light inspection signal carried out filtering and amplify, debugging being set and optimizing of main parameter all was that the update routine parameter is finished in single-chip microcomputer, and method of work is simple.
4, the frequency marking start is preheating to the time of locking weak point, and the standard frequency fluctuation of frequency marking output is little.General Rb atom frequency marking frequency marking starting up needs the long period to locking, and during this period of time the output pulsation of VCXO standard frequency is big; This digital servomechanism installation can be provided with a voltage initial value to VCXO in advance, the output before loop-locking that makes VCXO is all the time near the frequency when system lock, the physical system preheating is intact enter normal operating conditions after, loop can arrive keyed end realization frequency marking loop-locking apace by frequency preset point.Because near the frequency in when locking, the VCXO output frequency changes little whole process all the time, i.e. it is less that the accuracy of VCXO output is influenced by locking process, can allow Rb atom frequency marking enter normal operating state in advance.
5, can realize that Rb atom frequency marking physical system and high voltage stability control crystal oscillator carry out the advantage combination and improve the performance index of standard frequency output.。
6, has stronger environmental suitability.The traditional analog device, bigger as the temperature coefficient of transistor and electrochemical capacitor etc., be subject to electromagnetic interference, and native system adopts a large amount of digit chips, can overcome the influence that environmental change brings, antijamming capability strengthens.
Description of drawings
A kind of Rb atom frequency standard digital servo device block diagram of Fig. 1
Wherein, the photocell output connects the input of filter amplification circuit in the physical system of Rb atom frequency marking, the input of the ADC12 that single-chip microcomputer is integrated connects the output of filter amplification circuit, the SPI0 interface of single-chip microcomputer is connected to the SPI interface of 20 figure place weighted-voltage D/A converters (DAC1220) after by light-coupled isolation, the 2.5V reference voltage of reference circuit is connected to the reference voltage input of 20 figure place weighted-voltage D/A converters (DAC1220), the analog signal output of DAC1120 connects the input of isolating amplifier circuit, and the output of isolating amplifier circuit connects the voltage tuning end of VCXO.
Fig. 2 synchronizing software phase-demodulating principle figure
(A) the dextrorotation ripple is input light inspection signal, and solid line represents that this signal is identical with the reference signal phase place, and dotted line represents that this signal is opposite with the reference signal phase place, and dotted line is a second harmonic signal, the phase demodulation reference signal that square wave produces for Chip Microcomputer A C sampling interruption; (B) digital signal of gather and AC signal with reference to the first-harmonic that obtains after multiplying each other; (C) AC signal in a plurality of cycles obtains direct current signal after asking on average; (D) direct current signal obtains positive signal after adding a positive initial value, also for finally sending to the digital servo signal of 20 figure place weighted-voltage D/A converters (DAC1220).
Fig. 3 main program flow chart
Wherein, receive only ADC12 after main program is carried out in proper order and interrupt, all processing procedures of software phase demodulation are all finished in this interrupt service routine, and all programs all download to single-chip microcomputer.
Fig. 4 ADC interrupt service routine flow chart
Wherein, n is the interruption total degree of the generation of first-harmonic one-period, i is the counter that interruption times takes place in the first-harmonic one-period, j is the fundamental signal number of cycles that data of the every transmission of 20 figure place weighted-voltage D/A converters (DAC1220) comprise, data12 is the data that the integrated ADC12 of MSP430F169 once gathers, fd be the first-harmonic one-period the interchange amplitude and, m represents that twice 20 figure place weighted-voltage D/A converters (DAC1220) conversion interval is the periodicity of m first-harmonic, F0 be first-harmonic exchange and need add initially on the occasion of, FD is 20 figure place weighted-voltage D/A converters (DAC1220) data to be converted, and send () is the digital-to-analogue conversion subprogram of 20 figure place weighted-voltage D/A converters (DAC1220).
Digital-to-analogue conversion subprogram the send () flow chart of Fig. 5 20 figure place weighted-voltage D/A converters (DAC1220)
Wherein, INSR is a command register, can set the width of a data transaction position of 20 figure place weighted-voltage D/A converters (DAC1220), and low 4 is invalid bit during conversion, need move to left 4 to data before transmission.
S curve after the output of Fig. 6 20 figure place weighted-voltage D/A converters (DAC1220) is amplified
Wherein, but this curve assistant adjustment loop, rapid Optimum parameter and realize the locking of circuit loop and Rb atom frequency marking physical system, also whether check system can normally lock the householder method of work.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is described further:
As shown in Figure 1, a kind of Rb atom frequency standard digital servo device mainly is made up of filter amplification circuit 1, single-chip microcomputer 2, photoelectric coupled circuit 4,20 figure place weighted-voltage D/A converters 5 (DAC1220), voltage reference circuit 6, isolating amplifier circuit 7.
The input of filter amplification circuit 1 is as the input of this digital servomechanism installation, reception is from the light inspection signal of Rb atom frequency marking physical system, the output of filter amplification circuit 1 connects the integrated ADC input of single-chip microcomputer 2, single-chip microcomputer 2 12 integrated DAC outputs are locking indication end 3, after isolating by photoelectric coupled circuit 4, the SPI0 mouth of single-chip microcomputer 2 is connected to the SPI mouth of 20 figure place weighted-voltage D/A converters 5 (DAC1220), the output of voltage reference circuit 6 is connected to the Voltage Reference input of 20 figure place weighted-voltage D/A converters 5 (DAC1220), the output of 20 figure place weighted-voltage D/A converters (DAC1220) is connected to the input of isolating amplifier circuit 7, the output of isolating amplifier circuit 7 connects the voltage tuning end of Rb atom frequency marking VCXO as the output of this digital servomechanism installation.
Being input to filter amplification circuit 1 from the light inspection signal of Rb atom frequency marking physical system output carries out filtering, amplification and level and moves processing, the interference beyond the erasure signal bandwidth.Filter amplification circuit 1 is designed to three grades of homophases and amplifies form, and the amplifier of employing is the low-voltage ground noisy-type paster encapsulation amplifier OPA2350 of TI company.Wherein, the first order is that electric current changes voltage, and the second level is that the lower passband gain is amplified, and afterbody amplifies for gain.The positive input of amplifier is formed the DC level that dc bias circuit is regulated output signal by two resistance, guarantees amplitude output signal in the 0-2.5V scope, satisfies the level requirement when integrated ADC gathers in the single-chip microcomputer 2.The output signal of filter amplification circuit 1 is connected to single-chip microcomputer 2 integrated ADC collection inputs and carries out data acquisition.
Single-chip microcomputer 2 is MSP430F169, inner integrated 12 adc circuit.Be input to single-chip microcomputer 2 integrated ADC inputs from the light of filter amplification circuit 1 inspection signal and carry out data acquisition, the digital signal that 2 pairs of collections of single-chip microcomputer are come in is carried out the digital error signal that the synchronizing software phase demodulation obtains servo VCXO, this signal by through photoelectric coupled circuit carry out photoelectricity isolate after the SPI0 mouth be connected to the SPI interface of digital to analog converter 20 figure place weighted-voltage D/A converters 5 (DAC1220).Like this, the SPI mode of the digital error signal to be converted that single-chip microcomputer 2 obtains phase demodulation by single-chip microcomputer 2 sends to 20 figure place weighted-voltage D/A converters 5 (DAC1220) and carries out digital-to-analogue conversion, obtains the voltage-controlled error signal of servo VCXO again after isolating amplifier circuit 2 amplifies.Simultaneously, single-chip microcomputer 2 shows promptly that frequency marking enters lock-out state to the lock indication signal as demonstration Rb atom frequency standard locking state of gathering after signal transmission single-chip microcomputer 2 inner 12 the integrated DAC that come in carry out digital-to-analogue conversion when this output signal is the second harmonic of modulation signal; Isolating amplifier circuit 7 adopts two stage amplifer to form, and the first order connects into voltage follower, and the homophase input mode is adopted in the second level, and such isolation is fine.The clock signal of single-chip microcomputer 2 can be guaranteed the high stability of synchronizing software phase discrimination processing process from the VCXO output of Rb atom frequency marking.Single-chip microcomputer 2 is also exported the modulation signal of a square-wave signal as the microwave of excitation rubidium atomic transition by the PWM mode, obtains light inspection signal behind the microwave signal of this modulation and the rubidium atomic interaction.
The synchronizing software phase demodulation that carries out in single-chip microcomputer 2 is a core content of the present invention.The method of software phase demodulation as shown in Figure 2, light inspection signal is the frequency discrimination signal of exporting from the microwave signal of Rb atom frequency marking physical system internal modulation and rubidium atomic interaction.This signal mainly is the first-harmonic and the second harmonic of modulation signal, when the absworption peak centre frequency of microwave frequency that enters physical system and the generation of rubidium atomic transition equates, light inspection signal has only the second harmonic signal of modulation signal, and is unequal and to depart from absworption peak (either large or small) be the opposite fundamental signal of phase place.Shown in the top curve of (A), (A) dextrorotation ripple is a light inspection signal, and solid line represents that this signal is identical with the reference signal phase place, and dotted line represents that this signal is opposite with the reference signal phase place, dotted line is a second harmonic signal, the phase demodulation reference signal that square wave interrupts generation for Chip Microcomputer A C sampling; (B) for gathering the AC signal of the first-harmonic that obtains after the digital signal of coming in multiplies each other with reference; (C) ask for the AC signal in a plurality of cycles and obtain direct current signal after average; (D) for direct current signal adds the positive signal that obtains behind the positive initial value, also for finally sending to the digital servo signal of 20 figure place weighted-voltage D/A converters (DAC1220).The polarity reflection VCXO signal relative depature rubidium atomic transition spectral line absworption peak frequency of fundamental signal is a height or low, the big I of amplitude is recognized this distance that departs from and is directly proportional, utilize the phase polarity and the amplitude size character of fundamental signal to carry out first-harmonic synchronizing software phase demodulation, obtain dc error signal and remove servo VCXO at single-chip microcomputer interior focusing inspection signal.
Based on above-mentioned principle design, in single-chip microcomputer 2, adopt following software approach to realize the synchronizing software phase demodulation:
1 downloads to the main program 3 in the single-chip microcomputer 2, as 3 of accompanying drawing 1, specifically as shown in Figure 3.
(1) configuration-system clock, SPI0 and 20 figure place weighted-voltage D/A converters 5 (DAC1220);
(2) 20 figure place weighted-voltage D/A converter 5 (DAC1220) initial values are set;
(3) open ADC12 and interrupt, and the response interrupt service routine;
(4) main program finishes.
Wherein, main program is responsible for ADC, and DAC, 20 figure place weighted-voltage D/A converters (DAC1220) and custom variable carry out initialization, and the initial value of 20 figure place weighted-voltage D/A converters 5 (DAC1220) is set, make near the Frequency point of VCXO output frequency when Rb atom frequency standard locking, the PWM modulation signal is set.The synchronizing software phase discrimination processing is mainly finished in interrupt service routine, and after main program was carried out in proper order, single-chip microcomputer 2 just is in waited for the ADC interrupt status, interrupts when the ADC timer arrives the timing setting value, and interrupt service routine begins to carry out.
2 interrupt routines in accompanying drawing 3 10, detailed flow process such as accompanying drawing 4 are specially
(1) single-chip microcomputer is given intermediate variable data12 several assignment that ADC interrupts in the buffer memory, and interruption logging device i adds 1, and the data12 assignment is given the output buffers of the integrated DAC of single-chip microcomputer;
(2) judge i
A carries out the first-harmonic phase demodulation, if i＜n/2 then does one-accumulate to data12 and gives fd, if n/2＜i＜n is added to fd after then data12 being multiply by-1;
B has gathered the relevant treatment of a primitive period, interruption logging device i zero clearing, and the primitive period gathers number j and adds 1, the interchange amplitude of one-period and the fd zero clearing behind the FD that adds up once;
(3) judge j
If j=m, FD add that sending to 20 figure place weighted-voltage D/A converters (DAC1220) by subprogram send () behind the initial value F0 carries out digital-to-analogue conversion, the FD zero clearing after divided by n.
Wherein, n is the interruption total degree of the generation of first-harmonic one-period, i is the interruption times counter of the generation of first-harmonic one-period, j is the fundamental signal number of cycles that data of the every transmission of 20 figure place weighted-voltage D/A converters (DAC1220) comprise, data12 is that ADC12 once interrupts the data of gathering, fd be the first-harmonic one-period the interchange amplitude and, m interrupts sending Data Base number wave period in a fundamental signal one-period, F0 be first-harmonic exchange and need add initially on the occasion of, FD is the data that 20 figure place weighted-voltage D/A converters (DAC1220) send, send () is the transmission subprogram of 20 figure place weighted-voltage D/A converters (DAC1220), more than all variablees be global variable.Main program is responsible for ADC, and DAC, 20 figure place weighted-voltage D/A converters (DAC1220) and custom variable carry out initialization, and interrupt service routine is finished the synchronizing software phase discrimination processing.
The conversion routine of 3 digital to analog converter DAC1220, i.e. the subprogram 11 of Fig. 4, specifically as shown in Figure 5.
(1) router begins;
(2) send command register INSR, it is 20 that data width is set;
(3) digital-to-analogue conversion EP (end of program)
Among the present invention,, can guarantee servo high accuracy and the high-performance of making Rb atom frequency marking of this servo system by selecting high-resolution 20 figure place weighted-voltage D/A converters 5 (DAC1220).Voltage-controlled rate as the used 10M VCXO of certain Rb atom frequency marking is 0.5Hz/V, and tuning rate then is 5E-8/V relatively, the output area position 0-5V of 20 figure place weighted-voltage D/A converters (DAC1220), the voltage of 1LSB correspondence=5/12
20=4.7683 * 10
-6V is so the 1LSB of 20 figure place weighted-voltage D/A converters (DAC1220) is added to relative tuning rate=2.38 * 10 on the VCXO
-13, and the high target of Rb atom frequency marking short-term stability is all 10
-12Magnitude is so 20 figure place weighted-voltage D/A converters (DAC1220) can satisfy the high-precision servo requirement.
Be connected with the Rb atom frequency marking physical system when debugging according to the digital servo device system of the present invention program design and at first loop disconnected, promptly wouldn't be connected to the output of the isolating amplifier circuit 7 behind the 20 figure place weighted-voltage D/A converters 5 (DAC1220) on the VCXO, but scanning VCXO tuning voltage, 20 figure place weighted-voltage D/A converters 5 (DAC1220) are then exported servo voltage-controlled signal, these two voltage signals of synchronous recording just obtain what is called " S curve " figure as accompanying drawing 6, make the top of the corresponding rubidium atom of intersections of complex curve absworption peak according to the D0 value in this figure adjusting program, can realize locking to the loop closure then.
Claims (1)
1, a kind of Rb atom frequency standard digital servo device, it comprises filter amplification circuit (1), single-chip microcomputer (2), 20 figure place weighted-voltage D/A converters (5), isolating amplifier circuit (7), it is characterized in that: the input of filter amplification circuit (1) connects Rb atom frequency marking physical system light inspection signal output part, the output of filter amplification circuit (1) connects the integrated ADC input of single-chip microcomputer (2), 12 integrated DAC outputs of single-chip microcomputer (2) are the output of locking indication end (3), the SPI0 mouth of single-chip microcomputer (2) is isolated the SPI mouth that the back connects 20 figure place weighted-voltage D/A converters (5) by photoelectric coupled circuit (4), the output of voltage reference circuit (6) connects the Voltage Reference input of 20 figure place weighted-voltage D/A converters (5), the output of 20 figure place weighted-voltage D/A converters (5) connects the input of isolating amplifier circuit (7), and the output of isolating amplifier circuit (7) connects the voltage tuning end of VCXO in the Rb atom frequency marking.
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| CN201008146Y (en) * | 2007-02-16 | 2008-01-16 | 中国科学院武汉物理与数学研究所 | Rubidium atom frequency scale digital servo device |
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| CN110989325A (en) * | 2019-12-02 | 2020-04-10 | 北京无线电计量测试研究所 | Digital servo device and using method |
| CN110989325B (en) * | 2019-12-02 | 2021-07-20 | 北京无线电计量测试研究所 | Digital servo device and using method |
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| CN113556125B (en) * | 2021-06-28 | 2024-02-06 | 青岛中科英泰商用系统股份有限公司 | Method, system, electronic equipment and medium for improving AD conversion efficiency |
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| CN115128936B (en) * | 2022-06-01 | 2024-05-31 | 西安空间无线电技术研究所 | Phase detection and integration device and method for rubidium atomic clock digital servo |
| CN114938225A (en) * | 2022-07-25 | 2022-08-23 | 广东大普通信技术股份有限公司 | Phase synchronization circuit and phase synchronization method |
| CN117914308A (en) * | 2024-03-19 | 2024-04-19 | 成都中微达信科技有限公司 | Molecular clock device, molecular clock frequency control method and electronic equipment |
| CN117914308B (en) * | 2024-03-19 | 2024-05-31 | 成都中微达信科技有限公司 | Molecular clock device, molecular clock frequency control method and electronic equipment |
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